Oenothera Gigas. 



321 



parent species and its related forms, 0. biennis and so 

 forth. 



One of the most distinctive features of Oenothera 

 gigas hes in the breadth of the petals. The swollen 



Fig. 6i. Oenothera Lamarckiana. Top of a stem begin- 

 ning to flower, a, the lowest flower withered and fallen 

 down on the bract. 



character of the buds is due to this feature; as also is 

 the cup-like shape of the base of the open flowers. The 

 petals in this species, as in Lamarck's Evening Primrose, 



